QDialog()

class PySide2.QtWidgets.QDialog

class Form(QDialog):

    def __init__(self, parent=None):
        super(Form, self).__init__(parent)

        self.edit = QLineEdit("What's up?")
        self.button = QPushButton("Print to stdout")

        layout = QVBoxLayout()
        layout.addWidget(self.edit)
        layout.addWidget(self.button)

        self.setLayout(layout)

        self.button.clicked.connect(self.greetings)


    def greetings(self):
        text = self.edit.text()
        print('Contents of QLineEdit widget: {}'.format(text))

app = QApplication([])
form = Form()
form.show()
sys.exit(app.exec_())

setLayout(layout)

show()